Transmission doesn't shift past 2nd

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I got a 97 saturn sw2 automatic. This issue started with losing reverse, I did some research and found out that the input shaft nut can come lose. I ended up taking the tranny cover off and tighting the nut. Put iy bacl to gether with new fluids and filter.. had reverse then! Couple days later all of a sudden it starts shifting funny, like instead of going into 3 it would downshift into 2nd and would not shift into Drive or Over drive.. so I took valve body off cleaned everything n looked over the guts of tranny. All looked good.. Put it back together and now it shifts hard in 1st to 2nd won't go to 3rd, shifts hard into reverse nperformance doesn't work now.. Any clue on my issue?